SPEED's writers went through it and noted some interesting findings. i suggest all read up on it. it clarifies many of the "unknowns" that have been subject to debate recently: http://auto-racing.speedtv.com/article/indycar-49-page-wheldon-crash-report-explored/P1

Spoiler:

interestingly, they stated that car count was not a factor in the crash, and that it could have happened in a 15 car race under the same conditions. the main factor seems to be the pack racing, which they pointed out right away

Seriously, from what it sounds like, the reason he died was because he hit his head on the catch fence, which caused the blunt force trauma. Any person off the street could have told you that. Heck, I've known that for weeks now. The question is, will the new car fix that, and the only to find out is crash test dummies. I just hope they have some sense and do crash scenarios with dummies before they take it to the track.